# Impax Asset Management

Impax Asset Management is an Asset Manager based in London, United Kingdom.

## Overview

- **Organization type:** Asset Manager
- **Headquarters:** London, United Kingdom
- **Region:** Europe
- **Address:** London, United Kingdom
- **Founded:** 1998
- **Assets under management:** $30B - $40B (Altss estimate)
- **Website:** impaxam.com
- **LinkedIn:** https://uk.linkedin.com/company/impax-asset-management
- **Wikidata:** Q16994758

## Regulatory record

- **CRD number:** 171783
- **SEC file number:** 801-79931
- **Registration status:** APPROVED
- **Latest Form ADV filing:** 2025-12-22T06:00:00.000Z
- **Reports private funds:** Yes
- **Private funds reported:** 0
- **IAPD record:** https://adviserinfo.sec.gov/firm/summary/171783

## About

Impax Asset Management is an SEC-registered investment adviser in London, registered since 2014. It manages approximately $2.0 billion in regulatory assets. The firm has 165 employees and 53 investment advisers.

## Sectors

- Energy Transition & Renewables
- Infrastructure
- ClimateTech
- Industrial Tech

## Offices

- New York, United States
- Portsmouth, United States
- Hong Kong
- Tokyo, Japan
- Paris, France

## People

- Ian Simm — Founder and Chief Executive

## Questions

### Who runs investment decisions at Impax?

Ian Simm, the founder, serves as CEO and oversees the firm's strategic direction. The listed equities and private infrastructure teams operate with dedicated portfolio managers and investment committees, though Simm remains closely involved in product development and thematic positioning. The firm has not publicly disclosed a single CIO; investment authority sits with the heads of each strategy group under the executive committee.

### How does Impax source its private infrastructure deals?

Impax's private infrastructure team originates deals through a network of developers, project sponsors, and financial intermediaries across Europe and North America. The firm targets operating-stage renewable energy assets and energy-efficiency platforms, often acting as lead or co-lead investor. Impax also participates in auction processes run by utilities and independent power producers divesting non-core renewable portfolios.

### Is Impax involved in venture capital or only later-stage investments?

Impax's primary focus is on listed equities and mature private infrastructure assets. The firm has not historically maintained a dedicated venture capital strategy of material scale. Its private infrastructure funds target operational renewable energy projects rather than early-stage technology companies, though the listed-equity strategies can include growth-stage companies within their public-markets portfolios.

### How is Impax structured across public and private markets?

Impax operates through two distinct business divisions: listed equities, which runs thematic funds including the flagship Impax Environmental Markets trust, and private infrastructure, which manages closed-end funds targeting renewable energy platforms. The two teams share a common sustainability research framework but maintain separate investment processes, client bases, and fee structures.

## Related profiles

- [Impatient Ventures](https://altss.com/profile/impatient-ventures)
- [Impel Capital](https://altss.com/profile/impel-capital)

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Last updated: 2026-06-03T20:00:00.000Z

Canonical page: https://altss.com/profile/impax-asset-management

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